Window ventilator and silencer



Nov. 22, 1932. a N 1,888,711

4 WINDOW VENTILAI'OR AND SILENCER Filed Feb. 4. 1930 3 Sheets-Sheet l INVENTOR. Ram/v0 fi. Bow/Y: BY pyfi vg ATTORNEYS.

Nov. 22, 1932. a BQURNE 1,888,711

WINDOW VENTILATOR AND SILENCER Filed Feb. 4, 1950 3 Sheets-Sheet 2 A? j I Nov. 22, 1932. B, BOURNE v 1,888,711

WINDOW VENTILATOR AND SILENCER Filed Feb. 4. 1930 5 Shets-Sheet 3 IN V EN TOR.

Pom/v0 .5 flaw/r: BY

C 4 A TTORNEYS.

jPatent ed Nov. 22, 1932 UNITED- s'r rEsrArsNr OFFICE COMPANY, OF'HAB'IIOBD, CONNFCTICUT, A CORPORATION 01? CONNECTICUT V -wnn ow ,vnn'rm'roa am) sinuous Application filed I'ebraar 4, mo. Betta! 10.185398.

Many rooms and ofiices depend for their supply of fresh air upon that which results from opening the windows, the buildings in which they are located not'beingeq'uipped with ventilating systems. In certain locations the outside noise, either from a neighboring street or from some other source,"oe-

comes disagreeable when a window is opened,

noise silencing structure combined with it. I

A further object is to provide a window ventilating device of this character in which ventilation ma be secured either by the natural draft of the room" or by power. A further object is to provide a device of this character in which. air may. be. drawn into or forced out from the room as'desired. A further object is to provide a power operatedv window ventilating device in which the noise.

of the air blowing mechanism is effectively prevented from reaching the inside of the room. A further object is to provide a device of this character which shall be under the control of the occupants of the roomat all times, hoth as to the directionand as. to the intensity of air flow. A further object is to provide a deviceof this character which can be applied'to existing windows without necessitating any change in their structure. Other and further objects will appear from the following description and claims.

Referring to the drawings: I v

Fig. 1 is a perspectiveview of the device, partly broken away to show its internal construction;

' Fig. 2 is a plan section of the device, taken on'line 2.2 of Fig. 3;

Fig. 3 is a transverse section, taken on line 3-3 of Fig. 2; and Fig. 4 is a section on line 4-4 of Fig. 2, on an enlarged scale and showing the manner of supper-tin the motor blower to prevent trans er of v1 ration or noise. y

The device consists generally of a blower chamber having passages connecting it to the outside of the window and other passages connecting it to the interior of the room, these passages being designed minimize the transfer of sound through them. The various parts are supported by, and the passages referred to are mainly con tained in, a substantiallyrectangular casing composed of a top wall 1%, a bottom wall ll, two end walls 12 and 13, and a bacl: wall 14.. At the side of the casing which is to face towards the inside of the room is a cylindrical casing 15 divided into three compartments by a fan assembly 16 and a partition 17 The compartment to the left of the fan assembly" 16, as viewed in Fig. 1, connects with the space between the top wall 10 and the bottom wall 11. Extending from the fan assembly to the rear wall 14 188. artition 18, prefera'ounn :a. Banana, or muonn, conmrcunsssmnoa To run mm srumcna and treated so as to ably curved, which divi es the interior of the rectangular easing into two separated chamhers connected together only through the fan.

The artition 18 is preferably curved substantia y as an arc of a circle with the partition 17 as a center. Other partitions 19, 20, 21, 22 and 23 are positioned concentrically with the partition 18. Each of these partitions extends from the top wall 10 to the bottom wall 11, and-form between thema plurality of curved passages 24, 25, 26, 27 and 28, which extend between the central chamber 29 and ihe chamber 30 at the right of the partition 14. The space between the end wall 12 and the curved partition 18 is preferabl broken up by one or more partitions 31, whic may be curved similarly to the partition 18. In the space to the left of the partition 18, the bottom wall 11 extends, to a point short of the rear wall 14, sothat a space 32, opening to the bottom so as not to receive rain or snow, is provided-which may act as an intake or an outlet dependin upon which way the circulation of air is ta 'ng place. Assuming that air is being drawn -mto the room, the apparatus as thus far described willadmit air through thespaco'32, draw it into the chamber 33 to the left of the fan, and expel it into the central chamber 29; from where it moves in parallel streams through the,

The purpose providing the partitions which divide the air into parallel streams is to increase the surface contact of the air with m the stationary parts of the device and thus frictionelly extract the energy of any sound waves which may be present. The combined cross-sectional area of the parallel passages is enough to permit. the desired qu ntity of to pass without any substantiahesistance to flow; but at the same time the total well sres of the passages has been increasedto '2 point where e large proportion of the sound WEWGS will be eliminated during their pasthrough the device. To augment this e eet, the wells of the casings, as well as each suiiace of the several partitions, are covered with layer otsound absorbing material 34:, such fel Each partition consists of u control plate of steel or other materiel to which is cemented or otherwise secured.

layer of sound absorbing materiel 34 on each side The fan assembly, denoted generally by '16, comprises s multi-blede 35 directly coupled to the shaft of a motor 36, located within the cylindrical casing 15. Since one of the resin objects of the invention is to produce ventilating device which will prevent noise 35? from entering the room it is desirable to mount the ion assembly so that no sound due to its operation will come into the room either from the eir current or by vibration imparted to the wells of the casing. for as sound "waves traveling from the ten -through the air stream concerned. elimination of noise is accomplished in the some Way is with the noise from outside" the subdivided assa es.

lined with sound absorbent material serving this purpose. Direct transfer of vibrations to the casing wells is prevented by a, resilient mounting for the fan essembly' as will now he described.

Mounted against the inner surface of the sound absorbent material 3'; lining the cylindrical casing 15 iso ring 37 having a plurality of inwardly projecting lugs or clips 38.- i i-n intermediate ring or casing 39 is located with the ring 37 end is supported by springs or elastic cables 40 which are looped over s aced lugs and drawn around the suriace of t e in termediate ring. This arrangement permits the use of relatively long springs which act es shock absorbers and produce a hi h degree of vlbratlon insulation between t e rings. 'lhemotor 36 is supported in on inner clampmg ring 41 through an inter osed rubber packing 42, the clamping rin ing carried on webs 43 extending inwar y'from the intermediate ring. In the case shown, the websncmical efficiency ofthe deviceby reducing" the end losses of the fan blades.

In order to facilitate further the removal of the motor, it is provided with e flexible cable 46 and a detachable plug 47 fitting into a suitably insulated contact socket within the casing. The end of the partition 31 is cut sway as at 48 and the end of the cylindricel casing 15 is provided with a detachable esp 429 so that the motor and fan can be drawn bodily out of the casing when desired. This not only permits the withdrawal of these ports for repair but also permits the insultv tincture of interchangeable ventilating units which can be sold with or without a fan attcchrnent. The motor used is prefersoly of the reversing type, and :1 switch is provided serving to rotate the motor in a direct on to blow sir into the room, III e reverse direction to blow air out of the roonnor to shut oi the motor entirely. n

The Portion of the cylindrical casing 15 between the partition 1'? and the end i3 is provided with on opening edepted to closed by an oscillating shutter 51 running guides 52 end fitted with e handle shutter enables the occupant of the room shut ed the air entirely. in such a case is desirable to interlock the shutter with the motor control in order to prevent the rector becoming overheated due to being without sir circulation. in the present case, this hesbeen accomplished by contact memhers 54 on the partition 17, included in the motor circuit, and a bridge piece 55 which closes the gap between these contect members end completes the current supply to the motor. As soon as the shutteris moved away l'roin its 'wrde open position, the motor is stopped by the means described.

deflecting late 56 is mounted within the cylindrical casing as best shown in ig. 3,

forming together with the inner wall of the casing a sharply curved outlet passage 5'2.

This passage receives the air from'the pessagcs 24., 25,- 26, 27 and 28. unites the several streams, and delivers it to the outlet formed by opening the shutter 51. This passage affords additional attenuation for sound Waves reduces turbulence at this point, and deflects incoming air upwardly and towards the win bud '1 o hold the device snugly into the window casing it is made to such a length that elastic end pads 58 are tightly compressed when the device is inserted in the WllldOW frame.

The bottom is provided with a strip of com i but also serving to hold the silencer in place under the window. The device is further held by four adjustable L-sha d end clamps 62 held in place by a slot an wing nut connection 63. The clamps are locked in place tightly against the sides of the window casing so that there will be no possibility of pushing the device out of the window. By loosening the nuts 63, the device can be readily removed when desired.

What I claim is:

1.. A ventilator comprising a casing, a motor driven than in the casing, an acoustically silenced air passage between the fan and the I interior of the room, an' air-passage between the fan and the outer air, an adjustable shutter controlling the opening between said si-' lenced air passage and the room, and means for preventing operation of the fan except when'the shutter is open.

2. A ventilator comprising a casing adapted to be placed under the sash of a window, a partition dividing the interior of the casing into two chambers, one of said chambers communicating with the outer air and the other with the interior of the room, a motor driven blower in the casing interposed between the chambers and a plurality of rela- 'oftheroom.

i stantially tively thin partitions dividing the last named of said chambers into a plurality of easy curving, unobstructed passages adapted to attenuate sound waves pming therethrough without oll'ering substantial resistance to the passage of the air through the casing.

3. A window ventilator'comprising a substantially-rectangular casing adapted to be placed under the sash of a window, a cylindrical casing mounted on the indoor side of the first casing and communicating therewith, a motor driven fan in the cylindrical casing, a partition extending from the fan and-dividing the rectangular easing into an outdoor and an indoor chamber, said outdoor chamber having an opening to the outer air 'and the indoor chamber having a plurality of curved partitionsdividing into a plu-i rality of sound-attenuating p or Q '1: a h. tion'in the cylindrical casing forcing theair to traverse said n and from the cylindrical easing into i the interior 4. A window ventilator comprising a subrectangular casing adapted to be placed under the sash of a window, a c lin-.

.drical casing mounted on the indoor si e of an opemng.

the first casing and communicating therewith, a motor-driven fan in the cylindrical casing, a vibration proof mounting for the fan, a partition extending from the fan and dividing the rectangular casing into an outdoor and an indoor chamber, said outdoor chamber having an opening to the outer air and the indoor chamber having a plurality of curved partitions dividing it into a plurality of sound-attenuating passages, a partition in the cylindrical casing forcing the air to traverse said passages, and an opening from the cylindrical casing into the interior of the room.

5. A window ventilator comprising a casing adapted to be placed under the sash of a window, said casing having an outside opening and an inside opening, said casing providing an airway between said openings, and including a partition having an opening therein and arranged to divide the interior of the casing into two chambers, one of said chambers communicating with the outside opening, and the other chamber communieating with the inside opening, a motor driven blower mounted in the-opening in said dividing partition, a plurality of relatively thin partitions positioned in the last mentioned chamber and forming a plurality outside opening and the other chamber com-' municating with the inside opening, a inotor driven blower positioned in the opening in said dividing partition to direct the air crosswise of the casing at right angles to its direction of entrance and. at least one smoothly curving, tortuous, unobstructed sound attenuating passage formed in the last mentioned chamber, extending from the Ill blower to said inside opening, and curved to deliver the air substantially in its initial direction.

In testimony whereof I have ailixed my signature.

ROLAND B. BOURKE. 

